Psalms 51:12 - Matthew Poole's English Annotations on the Holy Bible

The joy of thy salvation; the comfortable sense of thy saving grace and help, promised and vouchsafed to me, both for my present and everlasting salvation. Uphold me; a weak and frail creature, never able to stand against corruption and temptation without thy powerful and gracious succours. Free; or, ingenuous, or liberal, or princely; which he seems to oppose to his own base, and illiberal; and disingenuous, and servile spirit, which he had discovered in his wicked and unworthy practices; and desires a better spirit of God, which may free him from the bondage of sin, and enable and incline him freely, and cheerfully, and constantly to run the way of God's precepts. See Exodus 35:21 Psalms 110:3 Romans 8:15,16 2 Corinthians 3:17.